High-voltage and impulse supply system



Sept. 29, 1959 l. HOROWITZ 2,906,918

HIGH-VOLTAGE AND IMPULSE'SUPPLY SYSTEM Filed May 14, 1957 IN VEN TOR.

IRVING HOROWITZ ATTORNEYS United Sttes Patent 01 HIGH-VOLTAGE AND IMPULSE SUPPLY SYSTEM Irving Horowitz, Eatontown, NJ., assignor to UV. Mfg. Corp., Newark, N.J., a corporation of New Jersey Application May 14, 1957, Serial No. 659,087

10 Claims. (Cl. 31527) The present invention relates to combined high-voltage and impulse-supply systems; and, more particularly, to systems in which cathode-ray sweep-voltage impulses and the like are employed not only for deflection purposes, but, also, for the generation of high direct-current voltage.

It has been customary in cathode-ray and similar circuits, for purposes of simplicity, to apply the horizontal sweep-voltage impulses through a transformer not only to the deflection yoke of a cathode-ray device, in order to produce horizontal electron-beam deflection, but, also, to a high-voltage rectifying tube for producing, from the impulses, a high direct-current voltage required for the accelerating anode or other electrodes of the cathode-ray device. The filament of the high-voltage rectifying tube has usually also been energized from the said transformer. There are occasions, however, as, for example, in the employment of small projection-type cathode-ray tubes and the like, where a very much higher direct-current power and a very much greater deflection power are required than in conventional cathode-ray television and related devices. Were one merely to drive the abovedescribed circuits with increased power, however, the horizontal sweep tube would become over-dissipated. If, accordingly, one employed more than one sweep tube, such as, for example, a pair of sweep tubes in parallel, this expedient, while eliminating the dissipation problem, would require very high voltage regulation by some complicated external circuit. If the required high voltage is in excess of about 40 kilovolts, more or less, indeed, conventional simple regulating circuits are not feasible. In addition, attempts to regulate very high voltages of this character in such circuits have been found to be accompanied with the very disadvantageous result that the width of the deflection available at the deflection yoke suffers variation. The problem, therefore, of providing simplified circuits of the above-described character that can successfully operate with very high-voltage and very high deflection power without causing either overdissipation of the circuits or variation in deflection width with regulation of the high voltage, has thus remained largely without solution, and resort has been had to more complicated circuits or to seriously compromised operation.

An object of the present invention, accordingly, is to provide a new and improved electric system that shall not be subject to the above-described disadvantages when operated with very high-voltage power and high d'eflection power, but that, to the contrary, enables the generation with simple circuits of extremely high voltages and of high deflection power without causing over-dissipation in the circuit and without variation of deflection width.

A further object is to provide a more general system of the character described that may be used with any type of source of impulses to generate from that source not only very high voltage, but also to deliver the impulses to a load. In summary, the above-described results are obtained in accordance with the present invention through i the use of a pair of amplifiers each having an input and an output circuit and a pair of transformer means one connected in each output circuit. Successive impulses, such as the before-mentioned sweep-voltage impulses, are applied to each input circuit from a common source. Rectifying means is provided connected with the transformer means in the output circuit of one of the amplifiers to produce the high direct-current potential. Part of that direct-current potential is reapplied to the input circuit of the said one amplifier to control the same in accordance with variations in the direct-current potential. A load, such as the deflection yoke, is connected to the other transformer means in the output circuit of the other of the said pair of amplifiers, and the cathode of the before-mentioned rectifying means is energized with heater current from the said other transformer means.

Other and further objects will be explained hereinafter and will be more particularly pointed out in the appended claims.

The invention will now be described in connection with the accompanying drawing, the single figure of which is a schematic circuit diagram illustrating the invention in preferred form.

While, as before mentioned, the invention is of particular utility in connection with its application to cathoderay-tube devices employing sweep-voltage impulses, it is to be understood that the following description, though directed to such devices, is more generally applicable to other types of systems in which it is desired to generate very high voltage from a source of impulses and also to deliver the impulses to a load. Referring to the drawing, a source of sweep-voltage impulses is shown at 1, comprising an electron-discharge tube having an anode 3, a control-grid electrode 5 and a cathode 7, shown grounded at 9. The term ground as used herein, is intended to connote not only actual earthing but also chassis or other reference potential. Connected between the anode 3 and the cathode 7 is a sweep-voltage capacitor 11. The anode 3 is connected to the positive source of plate potential B-lthrough a load resistor 13, the negative terminal of the source being the ground terminal 9. There may be applied to the control grid 5 successive positive trigger impulses along the input conductor 15 to cause the tube 1 periodically to conduct and thereby to permit the capacitor 11, which becomes charged from the 13+ terminal through the resistor 13, to effect successive discharges through the tube 1 between the anode 3 and the cathode 7 thereof. Sweep-voltage impulses accordingly result at the output conductor 17.

These sweep-voltage impulses are fed through similar coupling condensers or capacitors 19 and 19' to the input circuits of each of a pair of amplifiers 2 and 2'. The amplifiers 2 and 2, for purposes of illustration, are shown in the preferred form of pentodes having cathode electrodes 4 and 4, preferably grounded as at 6 and 6'; control-grid electrodes 8 and 8; screen-grid electrodes 10 and 10, connected to appropriate positive potential terminals labelled +VE; suppressor-grid electrodes 12 and 12, respectively strapped to the cathodes 4 and 4; and respective anode or plate electrodes 14 and 14. The sweep-voltage impulses supplied through the coupling condensers 19 and 19, to the input-circuit controlgrid electrodes 8 and 8 of the pair of amplifiers 2 and 2' produce, in the respective output circuits of the amplifiers 2 and 2, amplified impulses which are fed by respective output conductors 16 and 16 to respective transformers T and T connected thereto and shown as of the preferred auto-transformer type. The primary or lower portion of the winding T associated with the output circuit of the amplifier 2 is connected to the positive plate-potential terminal B+, as is the secondary or lower portion of the winding T associated with the output circuit of the amplifier 2. The upper or secondary portion of the autotransformer Winding T is connected by conductor 18 to the anode 20 of a high-voltage rectifier tube 21, having a cathode 22, of the heated type. The right-hand terminal'of the'cathode 22 isshown connected to an output lead conductor 23'for providing the direct-current high-voltage potentialresulting fromthe rectification by the rectifier 21 of the impulses fed from the output-circuit transformer T of the amplifier 2. This high-voltage. potential may, for example, be applied tor the anode of a cathode-ray device or similar member, schematically illustrated by the'symbol In accordance with the preferred embodiment of the present invention, this direct-current potential'may be simply regulated through feeding back a part of the direct-current potential by means of a bleeder network 25 and a feedback conductor 27 to a direct-current regulator amplifier 29. The output of the amplifier 29 may connect with the control electrode 8 in the input circuit of the amplifier 2 in order to control or regulate the direct-currentvoltage in accordance with variations appearing at the cathode 22 of the rectifier 21. Any other type of regulating system may similarly be employed.

The amplified and stepped-up impulses produced by the other amplifier 2', are fed from the lower or secondary part of the transformer T to the inductive deflectioncoil yoke or other load L for the purpose, for example,

of producing the electron-beam sweep deflection in the cathode-ray device. In order to insure that the high voltage applied to the cathode-ray device terminates upon failure of the deflection system, the heated-type cathode 22 of the rectifier 21 obtains its heater current by means of the winding P, preferably cooperative with the upper or primary winding of the same transformer T that also energizes the deflection. coil L.

Through the expedient, therefore, of separatingthe high-voltage supplyfunction and the yoke deflection supply. function by means of the separate stages 2 and 2', the very high-voltage supply may be regulated-without either variation of the deflection width during regulation or over-dissipation of the deflection circuit. This end is achieved, moreover, without sacrificing the safety feature that the high-voltage is prevented from being applied should a deflection failure occur, since the heater current for the rectifier 21 is obtained not from the transformer T but, rather, from the transformer T associated with-the deflection yoke L.

Modifications will occur to those skilled in the art and alljsuchare considered to fall within the spirit and scope of the invention as defined in the appended claims.

1. An electric system having, in combination, a pair of amplifiers each having an input and an output circuit, a pair of transformer means oneconnected in each output circuit, means for applying successive impulses to each input circuit, from a common source of impulses,,rectifying means provided with an anode and a cathode of the heated type, means for connecting the rectifyingrmeans with the transformer means inthe output circuit of one of the amplifiers to produce directcurrent potential, a load connected to the other transformer means in the output circuit of the other of the pair of amplifiers, and means energizable from the said other'transforrner means for heating the cathode of the rectifying means.

2. An electric system having, in combination, apair of amplifiers each having an input and an output circuit,

. a pair of transformer means one connected in each output circuit, means for applying successive impulses to each input circuit from a common source of impulses, rectifying means provided with an anode and a cathode of the heated type, means for connecting the rectifying means with the transformer means in the output circuit of one of the amplifiers to produce direct-current potential, means for applying part of the direct-current potential-to; the input circuit'of the said one amplifier to control the same in accordance with variations in the directcurrent potential, a load connected to the other transformer means in the output circuit of the other of the pair of amplifiers, and means energizable from the said other transformer means for heating the cathode of the rectifying means. I

3. An electric system having, in combination, a pair of amplifiers each having an input and an output circuit, a'pair-of'transformer-meanson'e eonnected in each output circuit, meansfor'applying successive, impulses to each input circuit from a commonsource of impulses, rectifying means provided with an anode and a cathode of the heated-type, meansfor connectingthe rectifying means with the transformer means in the output circuit of one of the amplifiers to produce direct-current potential, means for applying part of the direct-current potential to the input circuit of the said one amplifier to control the same inaccordance with variations in the directcurrent potential, an inductive load connected to the other transformer means in the output circuit of the other of the pair of amplifiers, and means energizable from the said other transformer means for heating the cathode of the rectifying means.

4. An electric system having, in combination, a pair of amplifiers each having an input and an output circuit, a pair of auto-transformer means one connected in each output circuit, means for applying successive. impulses to each input circuit from a common source of impulses, rectifying means provided with an anode and a cathode of the heated type, means for connecting the rectifying means with the auto-transformer means in the output circuit of one of the amplifiers to produce direct-current potential, means for applying part of the direct-current potential to the input circuit of the said one amplifier tocontrolthe same in'accordance with variations in the direct-current potential, a load connected to the other auto-transformer means in the output circuit of the other of the pair of amplifiers, and means energizable from the said other auto-transformer means for heating the cathode of the rectifying means.

5. An electric system having, in combination, a pair of amplifiers each having an input and an output circuit, a pair of auto-transformer means one connected in each output circuit, means for applying successive impulses to each input circuit from a common source of impulses, rectifying means provided with an anode and a cathode of the heated type, means for connecting the rectifying means with the auto-transformer means in the output circuit of one of the amplifiers to produce direct-current .potential, means for applying part of the direct-current potential to the input circuit of the said one amplifier to control the same in accordance with variations in the direct-current-potential, an inductive load connected to the other auto-transformer means in the output circuit of the other of the pair of amplifiers, and means energizable from the said other auto-transformer means for heating the cathode of the rectifying means.

6. An electric system having, in combination, a pair of amplifiers each having an input and an output circuit, a pair of transformer means one connected in each output circuit, means for applying successive impulses to each input circuit, from a common source of impulses, rectifying means provided with an anode and a cathode of the heated type, means for connecting the rectifying means with a secondary winding of the transformer means in the output circuit of one of the amplifiers to produce direct-current potential, means for applying part of the direct-current potential to the input circuit of the said one amplifier to control the same in accordance with variations in the direct-current potential, a load connected to a secondary winding of the other transformer means in the output circuit of the other of the pair of amplifiers, and means energizable from a primary winding of the said other transformer means for heating the cathode of the rectifying mean 7. An electric system having, in combination, a pair of amplifiers each having an input and an output circuit, a pair of auto-transformer means one connected in each output circuit, means for applying successive impulses to each input circuit from a common source of impulses, rectifying means provided with an anode and a cathode of the heated type, means for connecting the rectifying means with a secondary winding of the auto-transformer means in the output circuit of one of the amplifiers to produce direct-current potential, means for applying part of the direct-current potential to the input circuit of the said one amplifier to control the same in accordance with variations in the direct-current potential, a load connected to a primary winding of the other auto-transformer means in the output circuit of the other of the pair of amplifiers, and means energizable from a primary winding of the said other auto-transformer meansfor heating the cathode of the rectifying means.

8. An electric system having, in combination, a pair of amplifiers each having an input and an output circuit, a source of sweep-voltage impulses, means for feeding the impulses from the source to each input circuit, a pair of transformer means one connected in each output circuit, rectifying means having an anode and a cathode of the heated type, means for connecting the anode of the rectifying means with the transformer means in the output circuit of one of the amplifiers to produce high directcurrent potential at the said cathode, means for applying part of the direct-current potential to the input circuit of the said one amplifier to control the same in accordance with variations in the direct-current potential, a deflection yoke connected to the other transformer means in the output circuit of the other of the pair of amplifiers to produce a deflection field in response to the sweep-voltage impulses, and means for coupling energy from the said other transformer means to heat the said cathode of the rectifying means.

9. An electric system having, in combination, a pair of amplifiers each having an input and an output circuit, a source of sweep-voltage impulses, means for feeding the impulses from the source to each input circuit, a pair of transformer means one connected in each output circuit, rectifying means having an anode and a cathode of the heated type, means for connecting the anode of the rectifying means with a secondary winding of the transformer means in the output circuit of one of the amplifiers to produce high direct-current potential at the said cathode, means for applying part of the direct-current potential to the input circuit of the said one amplifier to control the same in accordance with variations in the direct-current potential, a deflection yoke connected to a secondary Winding of the other transformer means in the output circuit of the other of the pair of amplifiers to produce a deflection field in response to the sweep-voltage impulses, and means for coupling energy from a primary Winding of the said other transformer means to heat the said cathode of the rectifying means.

10. An electric system having, in combination, a pair of amplifiers each having an input and an output circuit, a source of sweep-voltage impulses, means for'feeding the impulses from the source to each input circuit, a pair of auto-transformer means one connected in each output circuit, rectifying means having an anode and a cathode of the heated type, means for connecting the anode of the rectifying means with a secondary winding of the auto-transformer means in the output circuit of one of the amplifiers to produce high direct-current potential at the said cathode, means for applying part of the directcurrent potential to the input circuit of the said one amplifier to control the same in accordance with variations in the direct-current potential, a deflection yoke connected to a secondary winding of the other autotransformer means in the output circuit of the other of the pair of amplifiers to produce a deflection field in response to the sweep-voltage impulses, and means for coupling energy from a primary winding of the said other auto-transformer means to heat the said cathode of the rectifying means.

References Cited in the file of this patent UNITED STATES PATENTS 2,444,902 Torsch July 6, 1948 2,566,432 Sziklai Sept. 4, 1951 2,628,326 Bridges Feb. 10, 1953 

